Circuit board



FIG. 1 is a rear, top, left side perspective view of a circuit board showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view shown in a used condition in a device shown in broken lines.

The broken line showing of the circuit board is included for the purpose of illustrating portions of the circuit board and forms no part of the claimed design. The dot and dashed lines mean a boundary between the claimed portion and the non-claimed portion. 

CLAIM The ornamental design for a circuit board, as shown and described. 